hammett



E. H'. CHAPMAN AND.' HAMMETT, OF PHILADELPHIA, PENNSYLVANIA. Letters Patent No. 72,798, ydated Decenzber 31, 1867.

BATH-BOILERS.

TO ALL WHOM IT MAY vCONCFRN.:

' vBe it known that we, E. HCHAPMA'N and T. HAMMETT, of Philadelphia, lPennsylvania, have invented an Improvement in Bath-Boilers; and We do hereby declare the following to bea full, clear, andexact ldescription of the saine. v

Our invention relates to that clnss of water-heaters which are known as circulating-boilers, and which are nsodin dwelling-houses-,in connection'with stoves andpranges, for al'ording'a constant supply of hot water; and our invention consists cfa boiler, with a peculiar arrangement of internal tubes, described hereafter, so

that a constant supply of hot water may lie-maintained within the boiler, and so that the hottest portion of the water may be first withdrawn. p

In order to enable othersfskilledpin the art to make and apply our invention, we will now proceed to describe its construction and operation, reference being had lto the accompanying drawing, which forms a part of this specileation, and in which-. Y Figure 1 is a vertical section ofl our improved bath-boiler, and

Figure 2 a sectional plan on the line 142, iig. 1. A. r A is a vertical 4cylindricalI reservoir,l or (as it is technically termed) boiler, through the lower end of which project three ltubes, a, c, d, of direrent lengths, the tube c communicating with a pipe, c', extending to the usual water-back, X, (shown in red lines,) of a fireplace, a. tube, b, extending from' near the lower side of the said water-.back to the .bot-toni of the boilenA, with which it communicates through an opening, z'. The tube a, vwhich projects but a few incheslabov-e the bottom of theboiler, communicates'with the hydrant, or with the cold-water reservoir, and the tube d, which projects a short distance above the centre of the boiler, communieates with a discharge-pipe. extending to any desired point. At the' upper Iend of the boiler is a valve, e, which opens inward, for a purpose described hereafter.

lheY cold water, admittedthrough the tube a, un'der pressure, to the boiler, Hows therefroml through the opening z', passes to the -lower part of the waterfback, in which, as it is heated, it rises, and thenA iiows to the tube'e anCl into the boiler, the hottest portiouof the water rising above the pipe ii, through which itis with. drawn` as required. i

' It will be seen that by the above-described :arrangement of tubes the coldest portion ot' the water in the' `boile1itlows first to the water-back, while the hottest portion-is always the ,first to be withdrawn; and that, as

the water can never be entirely withdrawn from the boiler through' the dischargefpipe, accidents resulting frorn such withdrawal are prevented, .'So long ,as there is any pressure 'withinthe boiler, the valve e will be maintained in its seat.- When, however, the pressurcceasesLthe valve will fall and admit the air, the collapsing of tlieboiler being'thu's prevented.,

We claim as'our invention, and desire-to secure 'by Letters Patent- The vertical 'boiler A, having internal-pipes a, c, and d, and-an opening, z', arranged in the mannerand for the purpose described.

In testimony whereof', we have signed our names to this specification in the presence of two; subscribing witnesses.

ED. H.- CHAPMAN, THO. M. HAMMETT.

Witnesses.:

CHARLES E. FOSTER, C. B. PRICE. 

